hare·brained /-ˈbrend/
(a.)輕率的,欠考慮的,粗心的
Hare·brained a. Wild; giddy; volatile; heedless. “A mad hare-brained fellow.” --North (Plutarch). [Written also hairbrained.]
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harebrained
adj : very foolish; "harebrained ideas"; "took insane risks behind
the wheel"; "a completely mad scheme to build a bridge
between two mountains" [syn: insane, mad]